Rob Allen Aluminum Tuna Railgun Speargun Open Muzzle
Compare prices from $380 to $410 at 2 shops
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Some customers describe friction around returns or refunds, and some also report slower replies or needing extra follow-up when they asked for help after ordering. Read the return terms closely before placing the order, especially the condition, packaging, and fee limits that can change the result.
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Quick Facts About Rob Allen Aluminum Tuna Railgun Speargun Open Muzzle
- A mid-to-long-range speargun built for experienced spearfishers targeting large pelagic species.
- Aircraft-grade aluminum barrel with 1.45 mm walls keeps the gun light without sacrificing rigidity.
- The open muzzle design lets you load twin 16 mm (5/8″) bands quickly, even under pressure.
- Dual power bands deliver the force needed to reach and stop bigger fish at distance.
- A 7 mm spring steel shaft holds its line through tough, twisting targets.
- Rob Allen’s Vecta 2 trigger mechanism gives a clean, predictable release with each shot.
- Available in multiple lengths, so you can match the gun to your typical dive conditions and target species.
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Rob Allen Aluminum Tuna RAILGUN Speargun – A Serious Pole-Spear-Style Railgun for Experienced Spearfishers
The Rob Allen Aluminum Tuna RAILGUN is a railgun-style speargun built for spearfishers who already know what they are doing and want a high-performance setup for targeting larger fish.
If you are new to spearfishing, this is not your starting point. But if you have time in the water and you are ready to move up to a capable, purpose-built railgun, the Tuna RAILGUN is worth a serious look.
What a Railgun Actually Is
A railgun speargun uses an open-track barrel rather than a fully enclosed tube. The shaft sits exposed along the top of the barrel on a rail.
This design reduces drag on the shaft as it leaves the gun, which means more speed and a flatter trajectory compared to a closed-barrel speargun of similar length. For targeting fast or large fish, that matters.
The Barrel
The barrel is made from aircraft-grade aluminum with a wall thickness of 1.45 millimeters. That spec tells you something useful: this is not a thick, heavy tube built for abuse. It is a precision-engineered barrel optimized for stiffness-to-weight ratio, the same logic applied in aerospace components.
The open muzzle design keeps the front of the gun unobstructed, which is standard for a railgun and allows the bands to load cleanly without interference.
Power and Bands
The Tuna RAILGUN comes with two 5/8-inch (16mm) power bands. Running double bands at that diameter gives you substantial propulsive force, which is appropriate for the shaft and the fish this gun is designed to pursue.
More band power means more effort to load. If your band-stretching strength is not there yet, a single-band setup on a shorter gun would serve you better while you build up.
The Shaft
The shaft is 7mm spring steel. Spring steel holds its shape under stress and resists the bending that can happen when a shaft hits bone or a hard substrate. At 7mm, it is a substantial shaft suited to the power the double bands deliver.
A thinner shaft would flex and slow down under that much band tension. The 7mm diameter keeps things honest.
The Trigger
The gun runs Rob Allen's Vecta 2 trigger mechanism. Rob Allen has a long reputation in the spearfishing community for smooth, reliable triggers, and the Vecta 2 is their current generation. A clean trigger release matters when you are holding tension on a loaded gun and waiting for the right moment on a fish that may not hold still.
Sizing
This listing covers multiple lengths, with the part number referencing a 110cm configuration. Railgun length selection depends on your typical hunting environment and target species.
- Shorter lengths are more maneuverable in reef or structure, where you are hunting at close range.
- Longer lengths give you greater range and are better suited to open water or blue-water hunting where fish are not going to let you get close.
The "Tuna" name signals that Rob Allen designed this gun with larger, open-water pelagic fish in mind. Choose your length accordingly.
Who This Gun Is Not For
If you are just getting into spearfishing, the double-band setup and the power this gun generates require experience to handle safely and effectively. Loading a high-tension double-band gun incorrectly is a real safety risk.
It is also not the right tool for shallow reef work where a shorter, lighter single-band gun would give you better control and less overpenetration on smaller fish.
The Bottom Line
The Rob Allen Aluminum Tuna RAILGUN is a well-specified, purpose-built speargun from a manufacturer with genuine credibility in the spearfishing world.
If you are hunting larger fish, you want open-water range, and you have the experience to load and handle a double-band railgun safely, this is a serious piece of equipment that does not compromise on the components that matter.
Specifications for Rob Allen Aluminum Tuna Railgun Speargun Open Muzzle
- Brand
- Rob Allen
- Model
- Tuna RAILGUN
- Material
- Aircraft grade aluminum
- Wall Thickness
- 1.45 millimeters
- Trigger Mechanism
- Latest Vecta 2
- Number of Power Bands
- 2
- Power Band Size
- 5/8" (16 millimeters)
- Shaft Material
- Spring Steel
- Shaft Diameter
- 7mm
- Muzzle Type
- Open Muzzle
- Available Lengths
- All Lengths
- Product Type
- Speargun
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